Brake.



. No. 663,597. Patented Dec. H, I900.

H. C. BEHR.

BR AK E.

(Application filed June 27, 1900.) (No Model.)

7 @775 ClfieEx Z w W Q/Ww HANS C. BEHR, OF SAN FRANCISCO, CALIFORNIA,ASSIGNOR TO THE FRASER dc OHALMERS, OF CHICAGO, ILLINOIS.

BRAKE.

SPECIFICATION forming part of Letters Patent N 0. 663,597, datedDecember 11, 1900.

Application filed June 27, 1900. Serial No. 21,772. (No model.)

Zen of the United States, residing at San Fran cisco, in the county ofSan Francisco and State of California, have invented a new and usefulImprovement in Brakes, of which the following is a specification.

My invention relates to improvements in brakes, and while itis devisedmore especially for use in hoisting machinery it is not to be limited touse in any particular connection.

In all brake mechanism of the class to which my invention relates and ofwhich I am aware the brake-blocks are pivotally mounted on levers insuch a manner that they may turn independently to cause the shoes tofind their bearings after contacting with the brakewheel, with theresult of unequal pressure and wear in use, or the levers which carrythe brake-blocks are supported to move in such a manner that thepressure and consequent wear of the shoes becomes greater at one endportion than at the other.

My object is to provide brake mechanism of an improved constructionwhich will operate positively to move the brake-shoes simultaneously andequally throughout their bearing-surfaces into and out of brakingengagement with the brake-wheel.

The drawing shows a brake wheel or drum provided with my improved brakemechanlSlIl.

A is a stationary bed-frame, and B a brake wheel or drum towhich thebrakes are applied.

0 O are brake-blocks each fitted in any approved manner with abrake-shoe at, having a bearing-face of the same are as the circumferential face of the wheel B. The brakeblocks are provided on theirrear sides, preferably midway between their ends, with bearing-ears band at their lower ends with bearings c.

D D are brake-levers pivotally connected near their lower ends to pinsZ) on the ears I) of the respective brake-blocks. At their lower endsthe levers are fulcrumed upon bearingpins 61 on the bed-frame. The upperend of the lever D is pivotally connected to the angle of a bell-cranklever E, which lever has a short arm 6 and long arm 0. A tie-rod F,provided with an interposed turnbuckle F, is pivotally connected at oneend to the short arm a of the bell-crank lever and at its opposite endto the upper end of the lever D.

G Gare links pivotally connected at their upper ends to pins 0, passingthrough the ears 0 of the brake-blocks and pivotally connected at theirlower ends to pins f on the bed-frame. The link G at the brake-block 0extends approximately parallel with the lever D, and the distancebetween its pivots f c is preferably exactly the same as the distancebetween the pivots d b of the said lever, and the link G at thebrake-block G extends approximately parallel with the lever D, and thedistance between its pivots f0 is preferably exactly the same as thedistance between the pivots d b" of the lever D.

In operation a downward pull on the long arm 6 of the bell-crank levermoves the lever D to the right and the lever D to the left, whereby thebrake-shoes are moved into contact with the brake-wheel. By reason ofthe link connections G the lower ends of the,

brake-blocks are moved positively in the arc of a circle, the same asthe ears 1), thereby causing the brake-shoes throughout their lengths tobe moved positively in the same way. As the distance of movement betweenbraking and release position of the shoes need be but a small fractionof an inch, the shoes move substantially in a horizontal line andequally throughout, whereby they contact with the wheel simultaneouslyover their entire braking-surfaces and with equal pressure throughout.Thus wear upon each brake-shoe will be the same over its entire engagingsurface, with the result of prolonging the life of the shoe, and thefull effect of the entire frictionface of the shoe under equal pressurethroughout will be brought against the brake-wheel. The brake-shoes maybe adjusted totake up any wear by simply turning the turnbuckle F toshorten the rod F.

For the purpose of strengthening the bedframe the brace-bar H isprovided.

While I prefer to construct the brake-operating mechanism throughout asshown and de scribed, it may be variously modified, as conditions rendernecessary or expedient, Without departing from the spirit of myinvention as defined by the claims.

What I claim as new, and desire to secure by Letters Patent, is

l. The combination with a brake-Wheel, of brake-blocks at opposite sidesthereof, an operating-lever for each brake-block to which the respectiveblock is pivotally connected at one point in its length, a connectionbetween the levers, and a swinging link for each brakeblock to which therespective block is pivotally connected at another point in its length,the lever and link at the same side of the wheel being movable insubstantially similar arcs at their points of connection with thebrake-block.

2. The C011] bination with a brake-wheel and HANS C. BEHR.

In presence of l D. W. LEE, A. D. BACCI.

